Microcheck 211

Antimicrobials are chemotherapeutic agents that are effective in treating microbial infections. Antibiotics are antimicrobial chemicals naturally produced by particular microorganisms.

■ How is the microbe that makes penicillin different from the one that makes streptomycin?

■ Define and contrast the terms chemotherapeutic agent antimicrobial, and antibiotic.

■ How might Streptomycesgriseus cells protect themselv from the effects of streptomycin?

Figure 21.1 Family Tree of Penicillins All of the derivatives contain 6-aminopenicillanic acid (6-APA), the core portion of penicillin G.

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